Nokia Smartphone

Nokia once led the world in mobile handset sales. Now, even a billion-dollar boost from Microsoft may not be enough to save it. The markets have seen the Windows Phone-based Lumia 900 -- and sent the stock to an all-time low.

When Nokia's CEO presents the company's strategy to investors in London on Friday, it could announce plans to use an outside operating system -- namely, Microsoft's , Google's or both, The Wall Street Journal reported Thursday.